Grinding disk



June 26, 1934.

Original Filed May 25', 19 31 Patented June 26, 1934 UNITED STATESGRINDING DISK Ingle R S'hue, Beloit, Wis., assignor to Gardner MachineCompany, Beloit, Wis., a corporation of Illinois Originalapplication May25, 1931, Serial No. 539,858. Divided and this application August 10,1931, Serial No. 556,049

8 Claims.

The present application is a division of applicants copendingapplication, Serial No. 539,858, filed May 25, 1931.

The invention relates generally to grinding wheels, and moreparticularly to wheels of the disk type.

IChe general object of the invention is to provide a new and improvedgrinding disk which may be readily attached to a supporting wheel, 19which is strong and not subject to cracking, and

which is so constructed that a maximum use of the abrading material ispossible.

More specifically, the object is to provide a grinding disk of thischaracter having a strength-- ening and securing means moulded thereinwhich is adapted to distribute the stress on the disk over the entireflat area of the disk, said strengthening and securing means being sopositioned in the abrading material that it occu- 220 pies a, minimumdepth in the rear face of the disk.

Another object is to provide a disk of this character which may bereadily attached to a supporting wheel in a grinding machine where onlythe front or top face of said wheel is readily accessible,

Other objects and advantages will become ape parent from the followingdescription taken in connection with the accompanying drawing, in

39 which:

Figure 1 is a fragmentary sectional view, taken on the line .1- 1 ofFig. 3, of a disk embodying the features of the invention.

F g. 2- is a fragme ta y view of h righ -hand face of the disk shown inFig. 1.

3 is a rear face view on a reduced scale of the supporting wheel.

While the invention is susceptible of various :modifications andalternative constructions, I have shown in the drawing and will hereindescribe in detail the preferred embodiment, but it is to be understoodthat I do not thereby intend to limit the invention to the specific formdisclosed, but intend to cover all modifications and alternativeconstructions falling within the spirit and. scope of the invention asexpressed in the appended claims,

The present embodiment of the invention comprises generally a supportingwheel which is adapted to be secured to a driving means, and a grindingdisk made of abrading material and positioned with its rear face againstthe supporting wheel. Embedded in this face of the grinding disk andcoextensive therewith is a means, such as a wire mesh, for strengtheningthe abrading material. Means is provided for clamping the grinding diskto the supporting wheel whereby the torsional stress will be transmittedfrom the supporting wheel directly to the strengthening means and thestresses due to centrifugal force will be resisted by the strengtheningmeans,

said clamping means being conveniently accessible and so positioned asto permit of use of the major part of the abrading material in the disk.

As shown in the drawing, a supporting wheel 10 is provided which isadapted to be secured to a driving means, as by screws (not shown)passing through holes 11 in the central portion of the supporting wheel10 and adapted to be threaded into a flange on the driving spindleof agrinding machine (not shown). Positioned with its rear face against thesupporting wheel 10 is a grinding disk 12 made of molded abradingmaterial.

To strengthen the grinding disk 12 and to prevent any part of it fromcracking due to excessive stresses or to expansion, means is providedwhich is embedded in the abrading material. In the present instance thismeans comprises a wire mesh 13 which is embedded in the rear face of thegrinding disk 12, and which extends to the periphery of the grindingdisk so that the edge of the latter will not crack off, The abradingmaterial fills the interstices of the wire mesh so as to form anintimate bpnd therewith. By positioning the wire mesh in the rear orinner face of the grinding disk, a maximum use of the abrading materialis permitted before the disk need be discarded or before additionalabrading material need be moulded thereon.

As mentioned above, the invention also includes means for clamping orattaching the grinding disk 12 to the supporting wheel 10 whereby thetorsional stress, when the wheel is driven, will be transmitted from thesupporting wheel directly to the strengthening means in order todistribute this stress over the whole transverse area of the abradingmaterial By such distribution of the stress, there is no localization ofthe latter at definite points, which might tend to crack the abradingmaterial, especially adjacent the periphery thereof.

In the embodiment shown in Figs. 1 and 2, the

clamping or attaching means comprises embedded members and removablemembers cooperating therewith. The embedded members, in the presentinstance, comprise a plurality of suitably spaced washers l4 embedded inthe abrading material and in contact with the inner face of the wiremesh 13. Concentric with the respective washers 14 are a plurality ofopenings 15, each of which extends through the abrading material to thefront face thereof and is adapted to receive the removable member, suchas a screw 16, which extends through the washer l4 and an interstice inthe wire mesh and is threaded into the supporting wheel 10. Thus, thescrews 16 are insertible from the front face, and the disk is convenientfor use on a machine where the rear face of the supporting wheel is notreadily accessible.

Each washer 14 is of a sufiicient diameter to extend over the wireforming said interstice, and the head of the screw is countersunk intothe washer. Thus, the screws 16 cause the washer 14 to bear against thefront face of the wire mesh to clamp the mesh against the supportingwheel 10, permitting the stress from the supporting wheel to betransmitted directly to the mesh. The openings 15 need only be largeenough to permit the screws 16 to be readily inserted, and preferablyare smaller in diameter than the washer 14.

From the above description, it will be apparent that I have provided agrinding disk which can not easily be cracked, since the wire meshdistributes the stresses over the whole area of the grinding disk andthe securing devices clamp the mesh directly to the supporting wheel atproperly spaced points.

I claim as my invention:

1. A grinding element comprising, in combination, a disk of bondedabrasive material, a wire mesh embedded in said disk, and a plurality ofwashers embedded in the abrading material against the inner face of thewire mesh, said disk having a plurality of openings moulded therein andconcentric with the respective washers, said openings being formed forthe reception of securing members adapted to bear against said washersand to extend through the mesh.

2. A grinding element adapted to be secured to a supporting diskcomprising, in combination, a grinding disk made of bonded abradingmaterial and adapted to be positioned with one face against saidsupporting disk, a wire mesh embedded in said grinding disk, and aplurality of washers embedded in the abrading material against the innerface of said mesh, said grinding disk having a plurality of openingsmoulded therethrough concentric with the respective washers, each ofsaid openings being formed for the reception of a screw adapted to bethreaded in said supporting disk and to extend through an interstice ofthe mesh and to have its head bear against the washer to clamp the meshto said supporting disk.

3. A grinding element comprising, in combination, a disk of abrasivematerial, a wire mesh embedded in said abrading material, and aplurality of washers embedded in the abrading matebedded in said disk,and a plurality of washers embedded in the abrading material against thein-- ner side of said wire mesh, said disk having a plurality ofopenings molded therein concentric with the respective washers andextending from said washers to the outer face of said disk, saidopenings being smaller than the diameter of said washers and beingformed for the reception of securing members adapted to bear againstsaid washers and to extend through interstices of the mesh.

5. A grinding wheel comprising, in combination, a supporting wheel, agrinding disk made of bonded abrading material and positioned with oneface against said supporting wheel, sheetlike reinforcing means mouldedto said grinding disk, a plurality of washers embedded in the abradingmaterial against the inner face of said reinforcing means, said grindingdisk having a plurality of openings molded therethrough concentric withthe respective washers, and a plurality of screws inserted in saidopenings and extending through the reinforcing means and threaded insaid supporting wheel, said screws having their heads countersunk intosaid washers.

6. A grinding wheel comprising, in combination, a supporting wheel,sheet-like reinforcing means, a grinding disk made of bonded abradingmaterial moulded to said reinforcing means, a plurality of washersembedded in the abrading material against the front face of saidreinforcing means, said grinding disk having a plurality of openingsextending from the front face of said reinforcing means to the frontface of said grinding disk and concentric with the respective washers,and a plurality of screws adapted to be inserted in said openings andextending through the reinforcing means and being threaded into saidsupporting wheel.

7. A grinding wheel comprising, in combination, a supporting wheel, agrinding disk made of bonded abrading material and positioned with oneface against said supporting disk, a wire mesh embedded in the grindingdisk, a plurality of washers embedded in the grinding disk against thefront face of said wire mesh, each washer extending over the wiresforming an interstice of said mesh, said grinding disk having aplurality of openings extending from said wire mesh to the front face ofsaid grinding disk, and a plurality of screws adapted to be insertedthrough said openings, each of said screws being threaded into saidsupporting wheel with its head bearing against one of said Washers andwith its shank passing through the interstice over which the washerextends.

8. A high-speed, heavy-duty grinding wheel comprising, in combination, arigid supporting wheel, a grinding disk of molded material positionedagainst one face of said supporting wheel, means for reinforcing saiddisk against centrifugal stresses in operation, comprising a sheet ofcoarse wire mesh embedded in the molded disk adjacent the rear facethereof, and two part means for securing said disk to said wheelcomprising a plurality of washers positioned in spaced relation in themolded disk and overlying the inner face of said wire mesh, said diskhaving a plurality of openings, one for each washer, extending to thefront face of the disk, and a plurality of screws, one for each washer,bearing against the respective washers and threaded into the supportingwheel, said wire mesh being composed of heavy strands Woven to formlarge interstices which are dimensioned so that each of said screws maypass through an individual interstice without severance of any of suchstrands and so that each of said washers overlies the strands of themesh which together form the sides of a single interstice, thetightening of said screws acting to clamp the mesh sheet and the moldeddisk as a unit to said supporting wheel, said meshsheet lyingsubstantially in a plane without sharp bends in the sheet and therebyserving to afford maximum resistance to centrifugal stresses in the diskby linear tension of the individual strands of said sheet.

INGLE R. SHUE.

